Improvement in gear-cutting attachments for lathes



J.VW. POST. Gear-Cutting Attachment for Lathes.

No. 208,491. Patented Oct. I, 1878.

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UNITED STATES PATENT OEEIcE.

JOHN W. POST, OF NEW YORK, N. Y., ASSIGNOETO USEFUL MACHINERY COMPANY. Y

IMPROVEMENT IN GEAR-CUTTING ATTACHMENTS FOR LATHES.

Specification forming part of Letters Patent No. 208,491, dated October1, 1878 application filed March 1l, 1878.

To all 'whom t may concern:

Be it known that I, JOHN W. POST, of New York, in the county of New Yorkand State of New York, have invented certain new and useful Improvementsin Gear- Cutting Attachments for Lathes and I do hereby declar that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and toletters of reference marked thereon, which form a part of thisspecification.

This invention relates to an improved gearcutting attachment for lathes;and it has for its object to provide a device which may be attached tothe slide-rest of an ordinary lathe, and by means of which all thevarieties of work usually effected by special machinery may beaccomplished at a cost infinitely less than where such special machineshave heretofore been required.

To this end my invention consists in a peculiarly-constructed wheel orrack-holder, which may be directly attached to the slide-rest of anordinary lathe, and which maybe adjusted thereon so as to present thework in such position as to be either cut into plain, beveled, or scrollgear-wheels and racks, as may be de Sired.

In the drawings, Figure 1 represents a side elevation of my improveddevice; Fig. 2, a vertical sectional view thereof; Fig. 3, a top view.Fig. 4 represents a vertical section of a modification of my invention,and Fig. 5 a view of the supplementary table.

The letter A represents a horizontal rest, having a slotted orbifurcated shank, a, by means of which it may be secured to thesliderest of a lathe by an ordinary binding screw or nut. Said rest isprovided with a head, al, having a vertical slot, a3, formed therein, inwhich is fitted the vertical shank B of a horizontal table, D. Saidhorizontal table serves to support and hold the devices for supportingthe work to be cut and adjusting the same with respect to the revolvingcutter, which is secured to the mandrel of the lathe.

The letter E represents a disk, rmly secured to a journal, e, the lowerend of which Immediately below said disk, and through which the lowerportion of the journal thereof" revolves, is located a slottedindicator, F, which extends toward the rear of the table D, and isprovided with a pointed extremity adapted to swing in the arc of acircle over a graduated sector, G. Directly below said slotted indicatoris located a sliding pawl, H, which serves the double purpose ofengaging' the slots in the disk E and forming a binding in connectionwith said indicator to secure it in position, the pawl being providedwith a series of screw-apertures, f, into which a binding-screw, g, maybe secured, so as to bind the two together and hold the indicator inposition.

The sliding shank of the table D is provided at its lower end with alever, I, fulcrumed to a bracket, J, attached to or forming part of thesaid head, so that it :may be elevated or depressed to properly presentthe work to the tool.

In order to provide for work of different diameters, the table D isformed with a series of bearings for the reception of the journal ot'the disk E, and the pawl H is provided with a series oi' screw-threadedapertures, by means of which it may be regulated to correspond with thechanged position of the indicator.

The letter K represents a supplementary table, which is provided withdownwardly-depending side lngs, t 7c, which are adapted to embrace thesides of the primary table D and be secured thereto by means ofset-screws k1 at various points, as shown at k2, to adapt the device towork of different diameters, as more fully hereinafter explained. Saidsupplementary table is provided near its front end with a sector, L,adapted to work in a guide on the table D, or by a set-screw, m, bymeans of which the said supplementary table may be set at any desiredangle with respect to the Said supplementary table horizontal table.

in its general arrangements is a counterpart of the horizontal table,and is adapted to support and carry the work, and is provided with anindicator and graduated sector, similar to the indicator and sector ofthe stationary table. The object of said supplementary table is toprovide for presenting the work at an angle to the tool, so as to cutbeveled gearing of any pitch, as will be readily perceived.

In the modifica-tion shown in Fig. 4 the elevating-lever is shownpivoted in the head of the rest, and provided at one end with aratcheted segment, O, which is adapted to engage a rack, I, formed onthe shank of the horizontal table, whereby said table maybe elevated.

The wheel to be cut is clamped upon the journal of the disk (specialcollars may be tted on the journal for correctly centering work ofdiierent diameters) by means of a binding-nut, It, so as to be held rmlythereto and travel with it when rotated.

The operation of my invention will be readily understood in connectionwith the above description. The rest A, being secured upon the ordinaryslide-rest of a lathe, presents the horizontal table I) and its work tothe rotating cutter secured to the revolving mandrel of the lathe. Theindicator and graduated sector serve to regulate the pitch of thegear-wheel to be eut, and the slotted disk, upon which the work issupported, serves to allow the work to be rotated, so as to allowr allportions of its periphery to be cut to be properly presented to thetool, the sliding pawl serving to secure saidrslotted disk in properposition.

Having thus described my invention, what I claim, and desire to secureent, is

1. In combination with the horizontal table, the rotating slotted diskfor supporting the work, andtheindicator and sliding pawl, for adjustingthe position of said disk and the work in respect to the cutting-tool,substantially as specified. n

2. The combination of the slotted indicator, sliding pawl, and theset-screw for binding` the two together, with the graduated sector andwork-holding disk, substantially as and for the purposes specified.

3. In combination with the horizontal table provided with a series ofbearings, as described, the slotted indicator and pawl, provided with aseries of screw-threaded apertures for the reception of a movablebinding-screw, substantially as and for the purposes set forth.

4. In combination with the horizontal table, the supplementary table,adapted to be `secured thereto at various angles, and provided withwork-carryin g devices, for the purpose of cutting beveled and scrollgear, substantially as herein set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

J. R. NOTTINGHAM, WILLIAM FITCH.

by Letters Pat-

